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DE-627 |
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231223s2004 xx ||||| 00| ||eng c |
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|a eng
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|a Chen, W
|e verfasserin
|4 aut
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|a Key influential factors for sludge pre-fermentation process design--a case study
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|c 2004
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|a Text
|b txt
|2 rdacontent
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|a ohne Hilfsmittel zu benutzen
|b n
|2 rdamedia
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|a Band
|b nc
|2 rdacarrier
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|a Date Completed 02.09.2004
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|a Date Revised 21.03.2007
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|a published: Print
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|a Citation Status MEDLINE
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|a Sewage sludge pre-fermentation process produces readily biodegradable carbon, which is essential for reliable biological phosphorus removal and efficient denitrification. This bench scale study was to develop site-specific design parameters for a sludge fermentation process, and to look into the effects of various influential factors. The key factors investigated induded solids retention time (4-8 days), temperature (9-19 degrees C) and sludge concentrations (0.5%-4% DS). The optimum Volatile Fatty Adds yield was found at a sludge concentration of 1%-1.5% DS. A solid retention time of 4 days at 15-20 degrees C was found to be most cost effective. The fermentation reaction was temperature sensitive, which was found to be inefficient at temperature below 12-15 degrees C. Under the optimum conditions, 80-100 mgVFA g(-1) VSS can be generated from fermentation process, which will result in an increase of 20-24 mg l(-1) in the settled sewage based on average flow. A significant pathogen reduction level was also demonstrated over the fermentation period. Liquid sludge from the small rural wastewater treatment plants is often imported to a regional sludge treatment centre for more advanced treatment to comply with the Regulations. The suitability of this imported sludge for pre-fermentation process was also investigated in this study
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|a Journal Article
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|a Sewage
|2 NLM
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|a Steen, F M
|e verfasserin
|4 aut
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|a Green, P G
|e verfasserin
|4 aut
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|i Enthalten in
|t Environmental technology
|d 1993
|g 25(2004), 4 vom: 18. Apr., Seite 381-90
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|x 1479-487X
|7 nnas
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